CA2300375C - Machine and method for preventing flange leakage - Google Patents
Machine and method for preventing flange leakage Download PDFInfo
- Publication number
- CA2300375C CA2300375C CA002300375A CA2300375A CA2300375C CA 2300375 C CA2300375 C CA 2300375C CA 002300375 A CA002300375 A CA 002300375A CA 2300375 A CA2300375 A CA 2300375A CA 2300375 C CA2300375 C CA 2300375C
- Authority
- CA
- Canada
- Prior art keywords
- diaphragm
- flange
- weld
- seal assembly
- platform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/167—Flanged joints characterised by the sealing means in connection with the appearance or detection of leaks
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
- Diaphragms And Bellows (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A diaphragm weld assembly for preventing fluid leakage from a flange. The diaphragm weld assembly has a flange having a platform, the platform having an opening and an annular weld pocket concentric with the opening, a diaphragm resting on the platform and having a ring extending from the bottom face of the diaphragm, the ring engaging with the opening, a weld bead formed in the annular weld pocket and welding the diaphragm to the flange, and a flange cover fastened to the flange. A method of creating the diaphragm weld assembly is also provided.
Description
MACHINE AND METHOD FOR PREVENTING FLANGE LEAKAGE
FIELD AND BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The present invention relates generally to a machine and method for preventing fluid leakage from a flange, in particular, to a new and useful flange seal utilizing a seal welded diaphragm.
FIELD AND BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The present invention relates generally to a machine and method for preventing fluid leakage from a flange, in particular, to a new and useful flange seal utilizing a seal welded diaphragm.
2. DESCRIPTION OF THE RELATED ART
Conventional flange connections are sealed by gaskets. Fluid leakage can occur on these flange connections after long-term service. Flange leakage is caused by displacement deformation of the gasket weld pockets on the flange and general wear and erosion on the gasket sealing surface.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and improved machine and method for preventing fluid leakage from a flange.
The diaphragm seal assembly consists of a flange with a platform which has an opening. An annular weld pocket is located on the platform concentric with the opening. A
diaphragm with a top face and a bottom face rests on the flange platform. A
ring extends from the bottom face of the diaphragm and engages with the opening on the flange platform. A
weld bead is formed in the annular groove and the diaphragm is seal welded to the weld bead on the flange platform. A flange cover is fastened to the flange.
The present invention has several advantages over known flange seal assemblies.
The present invention allows for clear access to the diaphragm for welding and NDE
(PT) or penetrant testing of the weld bead.
The annular weld pocket allows for removal and re-welding of the diaphragm during inspection outages without pre-heat or post weld heat treatment.
The present invention further allows for a temper-bead technique in accordance with Section III, Div. 1, NB~1622.11 of the ASME Code to weld buildup the annular weld pocket, thus eliminating the need for a field post weld heat treatment.
The diaphragm may be formed of Alloy 690 which has a high mechanical strength and a superior fatigue resistance as compared to carbon and low alloy steels.
Alloy 690 further has a coefficient of thermal expansion compatible with ordinary steel, the material generally used for flanges, and thus minimizes thermally induced stress in the seal weld.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Fig. 1 is a cross-sectional view of the diaphragm seal assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to Figure 1, in which like reference numerals are used to refer to the same or similar elements, diaphragm seal assembly 10 is used in combination with flange 12 having platform 14. Platform 14 has opening 16 and annular weld pocket 18 concentric with opening 16.
Conventional flange connections are sealed by gaskets. Fluid leakage can occur on these flange connections after long-term service. Flange leakage is caused by displacement deformation of the gasket weld pockets on the flange and general wear and erosion on the gasket sealing surface.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and improved machine and method for preventing fluid leakage from a flange.
The diaphragm seal assembly consists of a flange with a platform which has an opening. An annular weld pocket is located on the platform concentric with the opening. A
diaphragm with a top face and a bottom face rests on the flange platform. A
ring extends from the bottom face of the diaphragm and engages with the opening on the flange platform. A
weld bead is formed in the annular groove and the diaphragm is seal welded to the weld bead on the flange platform. A flange cover is fastened to the flange.
The present invention has several advantages over known flange seal assemblies.
The present invention allows for clear access to the diaphragm for welding and NDE
(PT) or penetrant testing of the weld bead.
The annular weld pocket allows for removal and re-welding of the diaphragm during inspection outages without pre-heat or post weld heat treatment.
The present invention further allows for a temper-bead technique in accordance with Section III, Div. 1, NB~1622.11 of the ASME Code to weld buildup the annular weld pocket, thus eliminating the need for a field post weld heat treatment.
The diaphragm may be formed of Alloy 690 which has a high mechanical strength and a superior fatigue resistance as compared to carbon and low alloy steels.
Alloy 690 further has a coefficient of thermal expansion compatible with ordinary steel, the material generally used for flanges, and thus minimizes thermally induced stress in the seal weld.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Fig. 1 is a cross-sectional view of the diaphragm seal assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to Figure 1, in which like reference numerals are used to refer to the same or similar elements, diaphragm seal assembly 10 is used in combination with flange 12 having platform 14. Platform 14 has opening 16 and annular weld pocket 18 concentric with opening 16.
Diaphragm 20 rests on platform 14. Key 22 extends upward from top surface of diaphragm 20. Weld bead 30 is formed in annular weld pocked 18 and provides a weld surface for seal welding diaphragm 20 to platform 14. Seal weld 60, diaphragm 20 and weld bead 30 are materials which do not require post-weld-heat treatment by the applicable design code.
Ring 24 extends from the bottom face of diaphragm 20 and engages with opening 16.
Flange cover 40 is positioned above diaphragm 20. Step 42 located in bottom surface of flange cover 40 engages with key 22.
Bores 50 formed in flange cover 40 are aligned with bores 50 formed in platform 14.
Studs and nuts (not shown) extend through bores 50 to fasten flange cover 40 to flange 12.
In a preferred embodiment of the invention, diaphragm 20 is formed of Alloy material.
In a further preferred embodiment of the invention, weld bead 30 and seal weld 60 is formed of P-43 weld metal. In another preferred embodiment of the invention, weld bead 30 is formed in accordance with Section III, Div. 1, NB-4622.11 of the ASME Code.
While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
Ring 24 extends from the bottom face of diaphragm 20 and engages with opening 16.
Flange cover 40 is positioned above diaphragm 20. Step 42 located in bottom surface of flange cover 40 engages with key 22.
Bores 50 formed in flange cover 40 are aligned with bores 50 formed in platform 14.
Studs and nuts (not shown) extend through bores 50 to fasten flange cover 40 to flange 12.
In a preferred embodiment of the invention, diaphragm 20 is formed of Alloy material.
In a further preferred embodiment of the invention, weld bead 30 and seal weld 60 is formed of P-43 weld metal. In another preferred embodiment of the invention, weld bead 30 is formed in accordance with Section III, Div. 1, NB-4622.11 of the ASME Code.
While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
Claims (16)
1. A diaphragm seal assembly comprising:
a flange having a platform, the platform having an opening and an annular weld pocket around the opening;
a diaphragm having a top face and a bottom face, the diaphragm resting on the platform;
a ring extending from the bottom face of the diaphragm, the ring engaging with the opening;
a weld bead formed in the annular weld pocket;
a seal weld welding the diaphragm to the annular weld bead on the platform; and a flange cover fastened to the flange.
a flange having a platform, the platform having an opening and an annular weld pocket around the opening;
a diaphragm having a top face and a bottom face, the diaphragm resting on the platform;
a ring extending from the bottom face of the diaphragm, the ring engaging with the opening;
a weld bead formed in the annular weld pocket;
a seal weld welding the diaphragm to the annular weld bead on the platform; and a flange cover fastened to the flange.
2. The diaphragm seal assembly according to claim 1 wherein the diaphragm is formed of Alloy 690.
3. The diaphragm seal assembly according to claim 1 wherein the annular weld bead and seal weld are formed of P-43 weld metal.
4. The diaphragm seal assembly according to claim 1 wherein the flange cover comprises a bottom surface, the bottom surface connected to the top face of the diaphragm, the bottom surface of the flange cover being offset from the platform.
5. The diaphragm seal assembly according to claim 4 wherein the bottom surface of the flange cover comprises a step, the top face of the diaphragm having a key, the key engaging with the step.
6. The diaphragm seal assembly according to claim 1 wherein the flange cover comprises a first plurality of bores, the platform having a second plurality of bores being aligned with the first plurality of bores, bolts extending through both plurality of bores, the bolts fastened by nuts.
7. A diaphragm seal assembly used in combination with a flange and a removable flange cover, the flange having an opening, the diaphragm seal assembly comprising:
a diaphragm positioned between the flange and the flange cover, the diaphragm having a top surface and a bottom surface;
a ring extending from the bottom surface of the diaphragm, the ring engaging with the opening;
an annular weld pocket located on the flange;
a weld bead formed in the annular weld packet; and a seal weld welding the diaphragm to the weld bead on the flange.
a diaphragm positioned between the flange and the flange cover, the diaphragm having a top surface and a bottom surface;
a ring extending from the bottom surface of the diaphragm, the ring engaging with the opening;
an annular weld pocket located on the flange;
a weld bead formed in the annular weld packet; and a seal weld welding the diaphragm to the weld bead on the flange.
8. The diaphragm seal assembly according to claim 7 wherein the diaphragm is formed of Alloy 690.
9. The diaphragm seal assembly according to claim 7 wherein the annular weld bead and seal weld are formed of P-43 alloy.
10. The diaphragm seal assembly according to claim 7 wherein the annular weld bead is formed in accordance with Section III, Div. 1, NB-4622.11 of the ASME Code.
11. The diaphragm seal assembly according to claim 7 wherein the flange cover comprises a first plurality of bores, the flange having a second plurality of bores being aligned with the first plurality of bores, bolts extending through both plurality of bores, the bolts fastened by nuts.
12. A method for creating a diaphragm seal on a flange sealed by a gasket, the method comprising the following steps:
removing a flange cover from the flange;
removing the gasket;
machining an annular weld pocket on a top surface of the flange;
depositing a weld bead in the annular weld pocket;
resting a diaphragm on the top surface of the flange;
seal welding the diaphragm to the annular weld pocket; and fastening the flange cover to the flange.
removing a flange cover from the flange;
removing the gasket;
machining an annular weld pocket on a top surface of the flange;
depositing a weld bead in the annular weld pocket;
resting a diaphragm on the top surface of the flange;
seal welding the diaphragm to the annular weld pocket; and fastening the flange cover to the flange.
13. The method in accordance with claim 12 wherein the weld bead is formed by a shielded metal arc welding process.
14. The method in accordance with claim 12 wherein the diaphragm is formed of Alloy 690.
15. The method in accordance with claim 12 wherein the annular weld bead and seal weld is formed of P-43 weld metal.
16. The method according to claim 12 wherein the weld bead is formed in accordance with Section III, Div. 1. NB-4622.11 of the ASME Code.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/281,891 US6203019B1 (en) | 1999-03-31 | 1999-03-31 | Machine and method for preventing flange leakage |
US09/281,891 | 1999-03-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2300375A1 CA2300375A1 (en) | 2000-09-30 |
CA2300375C true CA2300375C (en) | 2004-01-06 |
Family
ID=23079202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002300375A Expired - Fee Related CA2300375C (en) | 1999-03-31 | 2000-03-07 | Machine and method for preventing flange leakage |
Country Status (6)
Country | Link |
---|---|
US (1) | US6203019B1 (en) |
KR (1) | KR100635089B1 (en) |
CN (1) | CN1153016C (en) |
AR (1) | AR023191A1 (en) |
CA (1) | CA2300375C (en) |
RO (1) | RO120291B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6921090B2 (en) * | 2002-04-26 | 2005-07-26 | Babcock & Wilcox Canada Ltd. | Diaphragm for sealing openings in pressure vessels |
US6666637B1 (en) | 2002-12-02 | 2003-12-23 | Babcock & Wilcox Canada Ltd. | Segmented ring-nut for gasketed pressure vessel opening |
DE102004047159B4 (en) * | 2004-09-29 | 2006-09-07 | Danfoss Compressors Gmbh | Piston compressor, in particular hermetic refrigerant compressor |
CN102489829A (en) * | 2011-12-16 | 2012-06-13 | 保定天威集团有限公司 | Annular weld bead auxiliary welding device and welding method |
CN109973651B (en) * | 2019-03-25 | 2020-07-24 | 中国原子能科学研究院 | Diaphragm type sealing device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2841984A (en) * | 1953-05-06 | 1958-07-08 | Donald C Green | Connection for fluid pressure operated devices |
US3458683A (en) * | 1966-01-20 | 1969-07-29 | Atlas Chem Ind | Electron beam welding of a thin metal foil in a sandwiched type arrangement |
US3825712A (en) * | 1972-08-03 | 1974-07-23 | Kaiser Aluminium Chem Corp | Welding process |
US4188526A (en) * | 1976-03-15 | 1980-02-12 | Babcock-Hitachi Kabushiki Kaisha | Narrow weld-groove welding process |
US4135603A (en) * | 1976-08-19 | 1979-01-23 | United Technologies Corporation | Sound suppressor liners |
US4046010A (en) * | 1976-11-12 | 1977-09-06 | Beckman Instruments, Inc. | Pressure transducer with welded tantalum diaphragm |
US4265389A (en) * | 1978-10-30 | 1981-05-05 | Michael Mastromatteo | Method of welding a diaphragm assembly |
US5230248A (en) * | 1991-07-12 | 1993-07-27 | Rosemount Inc. | Corrosion resistant isolator |
CN2186843Y (en) * | 1993-08-04 | 1995-01-04 | 王明镜 | Flange plate |
US5711343A (en) * | 1996-07-30 | 1998-01-27 | Goodwin International Limited | Dual plate check valve |
US6038961A (en) * | 1998-03-02 | 2000-03-21 | Rosemount Inc. | Flush mount remote seal |
-
1999
- 1999-03-31 US US09/281,891 patent/US6203019B1/en not_active Expired - Lifetime
-
2000
- 2000-03-06 CN CNB001037455A patent/CN1153016C/en not_active Expired - Fee Related
- 2000-03-07 CA CA002300375A patent/CA2300375C/en not_active Expired - Fee Related
- 2000-03-27 KR KR1020000015565A patent/KR100635089B1/en active IP Right Grant
- 2000-03-28 RO ROA200000346A patent/RO120291B1/en unknown
- 2000-03-28 AR ARP000101383A patent/AR023191A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
CN1268634A (en) | 2000-10-04 |
KR100635089B1 (en) | 2006-10-17 |
CA2300375A1 (en) | 2000-09-30 |
RO120291B1 (en) | 2005-11-30 |
CN1153016C (en) | 2004-06-09 |
US6203019B1 (en) | 2001-03-20 |
AR023191A1 (en) | 2002-09-04 |
KR20000063030A (en) | 2000-10-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20180307 |